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[Bug rtl-optimization/64081] [5/6/7 Regression] r217827 prevents RTL loop unroll


https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64081

--- Comment #48 from David Edelsohn <dje at gcc dot gnu.org> ---
Based on Comment #45, is this a problem in the Stage 1 compilers?  Note that
Alan and Segher adjusted the doloop patterns in this release cycle.  Does
backporting that patch or bootstrapping with current trunk function better?

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